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(No Model.) 2 Sheets-Sheet l.

H. H. LINDEMUTH. WATER. TUBE STEAM BOILBR.

No. 433,415. Patented July 29, 1890..

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H. H. LINDEMUTH. WATEE TUBE STEAM BUTLER.

No. 433,415. Patented July 29, 1890K.

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"UNTTEQ STATES PATENT OFFICE..

HARRY H. LINDEMUTII, OF MOUNT JOY, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOPETER L. KREISS, OF SAME PLACE.

WATER-TUBE sTEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 433,415, dated July 29,1890 Application filed January 8, 1889. Serial No. 295,730. (No model.)

To all whom, t may concern:

Be it known that I, HARRY H. LINDEMUTH, a citizen of t-he United States,residing at Mount Joy, in the county of Lancaster and State ofPennsylvania, have invented a new and useful Improvement in Tater TubeSteam- Boilers, of which Ithe following is a specification.

This invention relates to improvements in water-tube steam-boilers; andit consists in certain novel features hereinafter described and claimed.In the accompanyingdrawings, Figure 1 is a perspective sectional view ofmy improved boiler. Fig. 2 is a sectional view of the inner casing, andFig. 3 is a detail sectional view.

Referring to the drawings by letter, A designates the inner casing,which is constructed of metallic plates B, bolted together,as shown. Thetop of the casing is provided near its rear end with an escape-opening Cfor the products of combustion, anda thimble D is secured to the top ofthe casing and extends through said opening and a similar opening in theouter casing, hereinafter referred to. The front end .of the casing isprovided with a suitable opening E for the purpose of permitting thefeed of fuel, and the said front end of the casing above saidfeed-opening is Y inclined slightly upward and rearward, as clearlyshown. This inclined portion F is `further provided with a number ofopenings G, in which the front ends of the boilertubes are secured. Therear end of the casing is provided about its centralportion withasimilar inclined par-t H, provided with a number of openings I, inwhich the rear ends of the boiler-tubes are secured. The boilertubes Jare thus secured in the casing, so as to have a downward and rearwardinclination, as shown.

The nre-chamber K is provided in the front end of the inner casing, andthe iire-wall L, forming the rear end of the fire-chamber, is extendedupward 4a suitable distance and provided with openings M, through whichthe boiler-tubes pass, the said extended portion M forming adeilectingsupport.

N designates a similar delecting-support secured to the top of thecasing and depending therefrom. This deflecting-support N is arranged inrear of the support M, and its lower edge -is slightly below the planeof the upper edge of the said front support. The products of combustionand heated air rising from the iire-chamber are thus given a tortu onscirculation toward the rear end of the casing. i

O designates a shield, which is arranged at a slight distance in advanceof the lire-wall, and has its upper edge curved rearwardly to the saidiire-Wall and secured thereto. An air-flue P is'thus provid ed betweensaid shield and the firewall, and the curved portion of said shield isprovided with a number of perforations Q, through which the air passesVto the space over the fuel in the lire-chamber.

R represents the out-creasing, which is also constructed of metallicplates bolted or otherwise suitably secured together, and the said outercasing is secured firmly in its proper relative position to the innereasing by Ineans of the long bolts S, which pass through the said innerand outer casings and are provided with suitable securing-nuts. The topof this outer casing is proyided near its rear end with anescape-opening T, through which the thimble D, above referred to,passes, the said thimble being riveted to the top of the casing andbeing adapted to be secured to a suitable smoke-pipe or other escape. Inpractice it will be understood of course the casings are V built into oraround the thimble, as the flanges on the thiinble prevent its beinginserted through the openings in the casings.l The front and rear endsof the outer casings are provided with openings U V opposite to thefront and rear ends of the boiler-tubes, ren spectively, which areclosed by suitable covering-plates WV X. These coveringplates aresecured to the casing in any suitable manner so as to be readilyremovable for the purpose of repairing or cleaning the tubes, and yetform a water-tight joint with the casing.

The front end of the outer casing is provided with a f u el-feed openingY, which registers with the feed-opening in the inner casing, and thespace between the two casings forms a water-chamber Z. The lower end ofthis water-chamber is closed by a frame a, which extends entirely aroundthe said lower end IOO ' ti rely heat the same.

of the chamber and is calked to prevent leakage. The boiler is providedwith a suitable metallic front b, which may be of any desiredconstruction, and carries the ordinary steamgage c. The steam-dome d isarranged on top of the outer casing, and is of the usual or anypreferred construction.

In practice the water-space is filled with water, which passes throughand fills the boiler-tubes, as will be readily understood. The tire iskindled in the lire-chamber and the fresh cold air passes through theash-pit beneath the same and up through the flue P in front of thelire-wall, entering' the firechamber and creating a draft. The productsof combustion and the heated air rising from the re pass over the top offthe front detlecting-support M', and then pass toward the reardeflecting-support N, which directs vthe same downward into theair-chamber in rear of the fire-walls. The current of heated air thentakes an upward 'turn toward the escape-pipe. It will thus be seen thatthe products of combustion and heated air are caused to circulate aroundthe boiler-tubes and en- The downward inclination of the boiler-tubesfacilitates the passage of the water therethrough, so that a constantcirculation of the water will be secured and a thorough conversion ofthe same into steam will be effected.

portion of the weight of the said tubes, and consequently preventingbuckling of the said ends of the casing. i

It is evident from the foregoing description, taken in connection withthe accompanying drawings, that I have provided a very simple andefficient steam-boiler, and its advantages are thought to be obvious. 4

Having thus described my invention, I claim- 1. The combination of theinner and outer casings, the fire-wall arranged Within the inner casing,a shield arranged in advance of the fire-wall and having its upperportion perforated and curved backward to the fire-wall and theboiler-tubes secured in said inner casing, as and for the purposes setforth.

2. A steam-boiler comprising an inner casing, an outer casingsurrounding the saine and forming a water-chamber therewith, the saidinner and outer casing-s having aligned escape-openings, a iiangedthimble secured in said openings by bolts passed through its flanges andthe casing, a frame secured between said casingsand forming the bottomof the water-chamber, and the boiler-tubes secured in the inner casin gand communicating with the Water-chamber, as set forth.

3. In a steam-boiler, the tire-wall L, a shield O, arranged ata slightdistance in advance of the lire-wall so as to form an air-flue P, ,the

bottoln of which is open, the top of the shield

